Pioneer VSX-2016AV-S Service Manual page 231

5
A
IC701 (pins 7,24,41,71,77,87,109,119)
12
Is
No
the voltage
1.8 V ?
Yes
IC771 (pin 1)
13 USB Power SW output
Is
No
the voltage
5 V ?
Yes
Replace IC771.
14 CN701 (pin 1) USB Bus power
Is
No
the voltage
5 V ?
Yes
Power supply is OK.
To STEP 3
Step 3: Operation of USB Media control IC
IC701 (pins 74,75)
XIN/XOUT
Does the
No
crystal oscillator
at 12 MHz
?
Yes
Check the parts and patterns in the path.
Replace X701, etc.
USCS/USCLK (Refer to Fig. 1 and 2)
Are
No
USCS and USCLK
high?
Yes
B
5
6
USB Media control IC
Check the parts and
patterns in the path.
Is pin 4 Is pin 14
No
(CTL) of IC771 (CTL) of CN702
high? high?
Yes
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
Note: Please confirm it with the USB memory connected for the content.
No
XRST must be high during operation.
Is XRST
Check the MOTHER Assy.
high?
Yes
USCS and USCLK should be
high during operation.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
6
7
No
Check the
MOTHER Assy.
Yes
Fig. 1
IC701
XRST pin 72
USCS pin 121
HREQ pin 122
USDAI pin 118
Fig. 2
IC701
USCLK pin 116
USDAO pin 115
TREQ pin 123
VSX-2016AV-S
7
8
IC953 (5 V → 3 V)
CN702
pin 3 pins 1,2 pin 5
pin 11 pins 12,13 pin 9
pin 6 pins 4,5 pin 12
pin 8 pins 9,10 pin 10
IC951 (3 V → 5 V)
CN702
pins 4,5 pin 6 pin 7
pins 9,10 pin 8 pin 11
pins 12,13 pin 11 pin 13
8
A
B
C
D
E
F
231